I just bought a 2003 10 ft Flagstaff hardtop and have no idea how to operate some things such as furnace and hot water. Does anyone know where I may download a operationg manual or where to purchase one?

Manuals for each appliance are available in .PDF format from their respective manufacturers web sites. There really is no specific manual for the RV itself like you would have with a car. The "owners manual" is not specific to the RVs and would not cover the appliance anyway.

I will look at the site for the individual manufacturers and hopefully this will help. I am just not sure how to activate/tuirn on the hot water and heat and also a little confused as to how the fridge operates with propane or electricity.